Clouds are made of countless water droplets, and sometimes these droplets collide with and stick to snow crystals.
云由无数的水滴构成，这些水滴相互碰撞粘着从而形成雪晶。
Snow is a form of frozen water. It contains many groups of tiny ice particles called snow crystals. These crystals grow from water particles in cold clouds.
雪是由冻水形成，包含大量细小冰粒的冻水被称作雪晶，这些晶体由寒冷云层中的小水滴形成。
Climate models have lots of parameters that are represented by numbers-for example how quickly snow crystals fall from clouds or for how long they reside within those clouds.
气候模型中有大量用数值表示的参数，例如雪花的结晶体脱离云层的速度、或者说它们在云层中会停留多长时间。
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